http://bugs.ghostscript.com/show_bug.cgi?id=691314
Summary: pattern accumulator needs to have its own copy alpha
operation
Product: Ghostscript
Version: HEAD
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P4
Component: Color
AssignedTo: michael.vrhel at artifex.com
ReportedBy: michael.vrhel at artifex.com
QAContact: gs-bugs at ghostscript.com
Estimated Hours: 0.0
Commit, rev 11213 fixed a problem when using GraphicsAlphaBits in the presence
of patterns. The fix involved intialializing the pattern's bit buffer
appropriately so that when gx_default_copy_alpha performed a get_bits command
it would obtatin valid data. It would be better to have the pattern
accumulator set up with it's own copy_alpha opereation that made use of the
mask buffer in the pattern object that keeps track of data that has been drawn
in the pattern's buffer. The copy_alpha will need to update the mask to ensure
that the anti-aliased graphic is completely drawn when the tiling operation
occurs as well as make use of the mask to only compute the alpha from those
values.
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